Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Subkingdom Pteridobiotina Britton & A. Br. (1896)
     Superdivision Cycadophytanae Doweld (2001) see Superphylum Cycadophytanae Doweld (2001)
       Division †Pteridospermatophyta Meyen
         Class †Phasmatocycadopsida Doweld (2001)
           Order †Gigantopteridales X.X.Li & Z.Q. Yao (1983)
             Family †Gigantopteridaceae Koidzumi (1936)
               Genus †Cathaysiopteris Koidz. (1934)